7.8
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7.8
No.
39.6
A number divided by 5 may be called a dividend. For example, in the problem 30 divided by 5 = 6, 30 is the dividend, 5 is the divisor, and 6 is the quotient. When the quotient has no remainder, the number is called a multiple of 5. For instance, 30 is a multiple of 5, while 29 is not, as 29/5 = 5 with a remainder of 4.
If x ≡ 39 mod 357 then: x = 357k + 39 for some integer k. Now 357 = 21×17, and 39 = 2×17+5 → x = 21×17×k + 2×17 + 5 → x = 17(21k + 2) + 5 → x = 17m + 5 where m = 21k + 2 (is an integer) → x ≡ 5 mod 17 → the remainder when the number is divided by 17 is 5.